JPS6234488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tapered reamer having at least one cutter plate exchangeably disposed in and retained within a longitudinal groove parallel to the axis of the cutter head.

Taper reamers with blades fixedly arranged in a straight or helical groove are known for premachining and finishing the bore of the taper reamer. Single-blade taper reamers with adjustable clamped cutter plates are also known, which cutter plates have only a relatively small tip space due to the structural arrangement of the clamping and adjusting elements. Such a reamer can thereby only be used for finishing operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a taper reamer that can hold a cutter plate in a longitudinal groove of a cutter head without narrowing the tip space.

According to the invention, both end faces of the cutter plate have inclined faces, the end face on the shank side joins to the similarly inclined support face of the cutter head, and the other front end face faces the end face of the cutter head. The clamping member is disposed on the clamp member and the clamping member is connected to a similarly inclined clamping surface, and the inclined surface forms an acute angle with the dorsal side of the cutter plate which joins the dorsal side of the longitudinal groove, and at the same time the free surface of the cutter plate. This can be solved by sloping it at an acute angle.

In order to firmly clamp the cutter plate, in one embodiment of the invention, the end face of the reamer is provided with a clamping ring which can be screwed on, the clamping ring having a projection that engages in a groove in which the cutter plate is received. , the end slope of the projection is pressed against the end face of the cutter plate opposite the shank of the reamer.

In a further advantageous embodiment, the cutter plate is designed as a reversible deflection plate, which is known per se, and has two faces forming an obtuse angle with respect to each other on each end face.

In another embodiment, if two diametrically opposed cutter plates are arranged in the cutter head of the reamer, the clamp ring has two diametrically opposed projections, and the clamp ring has two diametrically opposed projections; The end faces are formed with oppositely inclined slopes.

In yet another embodiment, the front end face of the clamping ring has a bowl-shaped recess for accommodating the screw head of the clamping screw.

In another advantageous embodiment, the cutter plate is
In order to avoid the formation of wide chips that make ejection difficult, one deflection plate has two interrupted cutting edges, in which case when using several cutters the interruptions are They are arranged with their positions shifted from each other.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Cutter head 1 in the shape of a truncated cone (truncated cone)
In this cutter head, vertical grooves 11 and 11' parallel to the axis accommodate two turning cutter plates 2 and 2', which can be used by changing their directions, and the back side 6 of these cutter plates is Vertical grooves 11, 11'
It is joined to the dorsal surface 5 of. The front end face 23 of the deflection cutter plate has an inclined surface, on which one protrusion 33 of each clamp ring 3 is attached.
and 33' face each other, and the protrusion is pressed against the end faces of the cutter plates 2 and 2' by a tightening screw 4 screwed into the internal thread of the cutter head. The clamp ring 3 has one hole 31 that accommodates the screw 4.
and two recesses 32, 32' aligned with the chip ejection groove of the cutter head.

The end faces of the protrusions 33, 33' form an angle α with the cross section of the cutter head in the radial direction, as shown in FIG. 4, and an angle β in the circumferential direction, as shown in FIG. Slanted to form. In this way, an inclined surface 331 is formed, which allows the cutter plate to move from one side to the longitudinal groove 1.
1 and 11' are pressed in the direction of arrow A shown in FIG. 9, and on the other hand, a force shown by arrow B acts against the bottom of the longitudinal groove in a direction perpendicular to the drawing plane of FIG. Pressed in the direction of the component force. cutter 2,
The cutting edge 2' has a notch 21 to form a thin chip. The chest of the cutter has a narrow part 2 formed by two rake angles cut into the sides.
2, and the cutter has longitudinal grooves 11 and 1 in this elongated part.
1' is in contact with the front side.

The ends of the longitudinal grooves 11, 11' on the shank side are provided with an inclined surface corresponding to the inclined surface 331 of the clamp ring 3 and used as a stop for the cutter plate, and the shank side of the cutter head 2, 2' is provided on this inclined surface. The inclined surfaces of the end surfaces 23' are joined. The inclined surfaces at both end surfaces 23, 23' of the cutter plates 2, 2 form an acute angle with the back surface 6 of the cutter plate that joins the back surface 5 of the longitudinal grooves 11, 11', and at the same time, the free surface of the cutter plate It is inclined to form an acute angle with 24.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the tapered reamer according to the present invention, Fig. 2 is an enlarged cross-sectional view taken by the arrow in Fig. 1, Fig. 3 is a side view of the clamp ring, and Fig. 4 is a side view of the clamp ring. 5 is another side view of the clamp ring rotated by 90 degrees from the state shown in FIG. 4, FIG. 6 is a front view of the turning cutter plate, and FIG. FIG. 8 is an end view of the cutter plate shown in FIG. 8, and FIG. 9 is a partial front view showing the end portion of the cutter plate in which the clamp ring protrusion shown by the dashed line is in contact, enlarged from FIG. 6. is a plan view of the end side of the cutter plate as seen in the radial direction; 1... Cutter head, 2, 2'... Cutter plate, 3... Clamp ring, 11, 11'
...Vertical groove, 33, 33'...Protrusion, α, β...
angle.

Claims (1)

Claims: 1. In a tapered reamer having at least one cutter plate exchangeably arranged in and retained in a longitudinal groove parallel to the axis of the cutter head, the cutter plates 2, 2' Both end faces 2
3, 23' have inclined surfaces, of which the shank-side end surface 23' joins a similarly inclined support surface of the cutter head 1, and the other front end surface 23'
is the similarly inclined clamping surface 331 of the clamping member 3 arranged on the end face side of the cutter head 1.
The inclined surface is connected to the longitudinal grooves 11, 11'.
cutter plates 2, 2' joined to the dorsal side 5 of
A taper reamer characterized in that it is inclined so as to form an acute angle with the back surface 6 of the cutter plate and at the same time form an obtuse angle with the free surface 24 of the cutter plates 2, 2'. 2. The protrusions 33, 33' where the clamping surface of the clamp member engages in the grooves 11, 11' that accommodate the cutter plates 2, 2', i.e. the protrusions 33 of the clamp ring 3 that can be screwed onto the end face of the reamer. ,3
Taper reamer according to claim 1, formed by 3'. 3. The clamp ring 3 has two protrusions 33, 33' located diametrically opposite each other, and the end surfaces of the protrusions are formed to be inclined in two ways with respect to the cross section of the cutter head. A taper reamer according to any one of claims 1 or 2. 4. Claims 1 to 3, wherein the cutter plate is formed as a turning plate that can be used by changing its direction, and has two sloped surfaces forming an obtuse angle with each other on each end face. any one of
Taper reamer as described in . 5 In a tapered reamer having at least one cutter plate exchangeably arranged in and retained in a longitudinal groove parallel to the axis of the cutter head, both end faces 2 of the cutter plates 2, 2'
3, 23' have inclined surfaces, of which the shank-side end surface 23' joins a similarly inclined support surface of the cutter head 1, and the other front end surface 23'
is the similarly inclined clamping surface 331 of the clamping member 3 arranged on the end face side of the cutter head 1.
The inclined surface is connected to the longitudinal grooves 11, 11'.
cutter plates 2, 2' joined to the dorsal side 5 of
is inclined at an acute angle with the dorsal surface 6 of the cutter plate and at the same time with an obtuse angle with the free surface 24 of the cutter plate 2, 2', and is characterized in that the cutter plate 2 has an interrupted cutting edge. Taper reamer. 6. The taper reamer according to claim 5, wherein the interrupted portions of the cutting edges of two continuous cutter plates 2 around the cutter head are arranged with their positions shifted from each other.